blob: 02e6f5463650ad96ce65072ce8489f9630a0f9d1 [file] [log] [blame]
/*
* (C) 1999-2003 Lars Knoll (knoll@kde.org)
* Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public License
* along with this library; see the file COPYING.LIB. If not, write to
* the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "config.h"
#include "core/css/CSSStyleSheet.h"
#include "HTMLNames.h"
#include "SVGNames.h"
#include "bindings/v8/ExceptionState.h"
#include "core/css/CSSCharsetRule.h"
#include "core/css/CSSImportRule.h"
#include "core/css/CSSParser.h"
#include "core/css/CSSRuleList.h"
#include "core/css/CSSStyleRule.h"
#include "core/css/MediaList.h"
#include "core/css/StyleRule.h"
#include "core/css/StyleSheetContents.h"
#include "core/dom/Document.h"
#include "core/dom/ExceptionCode.h"
#include "core/dom/Node.h"
#include "weborigin/SecurityOrigin.h"
#include "wtf/text/StringBuilder.h"
namespace WebCore {
class StyleSheetCSSRuleList : public CSSRuleList {
public:
StyleSheetCSSRuleList(CSSStyleSheet* sheet) : m_styleSheet(sheet) { }
private:
virtual void ref() { m_styleSheet->ref(); }
virtual void deref() { m_styleSheet->deref(); }
virtual unsigned length() const { return m_styleSheet->length(); }
virtual CSSRule* item(unsigned index) const { return m_styleSheet->item(index); }
virtual CSSStyleSheet* styleSheet() const { return m_styleSheet; }
CSSStyleSheet* m_styleSheet;
};
#if !ASSERT_DISABLED
static bool isAcceptableCSSStyleSheetParent(Node* parentNode)
{
// Only these nodes can be parents of StyleSheets, and they need to call clearOwnerNode() when moved out of document.
return !parentNode
|| parentNode->isDocumentNode()
|| parentNode->hasTagName(HTMLNames::linkTag)
|| parentNode->hasTagName(HTMLNames::styleTag)
|| parentNode->hasTagName(SVGNames::styleTag)
|| parentNode->nodeType() == Node::PROCESSING_INSTRUCTION_NODE;
}
#endif
PassRefPtr<CSSStyleSheet> CSSStyleSheet::create(PassRefPtr<StyleSheetContents> sheet, CSSImportRule* ownerRule)
{
return adoptRef(new CSSStyleSheet(sheet, ownerRule));
}
PassRefPtr<CSSStyleSheet> CSSStyleSheet::create(PassRefPtr<StyleSheetContents> sheet, Node* ownerNode)
{
return adoptRef(new CSSStyleSheet(sheet, ownerNode, false, TextPosition::minimumPosition()));
}
PassRefPtr<CSSStyleSheet> CSSStyleSheet::createInline(Node* ownerNode, const KURL& baseURL, const TextPosition& startPosition, const String& encoding)
{
CSSParserContext parserContext(ownerNode->document(), baseURL, encoding);
RefPtr<StyleSheetContents> sheet = StyleSheetContents::create(baseURL.string(), parserContext);
return adoptRef(new CSSStyleSheet(sheet.release(), ownerNode, true, startPosition));
}
CSSStyleSheet::CSSStyleSheet(PassRefPtr<StyleSheetContents> contents, CSSImportRule* ownerRule)
: m_contents(contents)
, m_isInlineStylesheet(false)
, m_isDisabled(false)
, m_ownerNode(0)
, m_ownerRule(ownerRule)
, m_startPosition(TextPosition::minimumPosition())
{
m_contents->registerClient(this);
}
CSSStyleSheet::CSSStyleSheet(PassRefPtr<StyleSheetContents> contents, Node* ownerNode, bool isInlineStylesheet, const TextPosition& startPosition)
: m_contents(contents)
, m_isInlineStylesheet(isInlineStylesheet)
, m_isDisabled(false)
, m_ownerNode(ownerNode)
, m_ownerRule(0)
, m_startPosition(startPosition)
{
ASSERT(isAcceptableCSSStyleSheetParent(ownerNode));
m_contents->registerClient(this);
}
CSSStyleSheet::~CSSStyleSheet()
{
// For style rules outside the document, .parentStyleSheet can become null even if the style rule
// is still observable from JavaScript. This matches the behavior of .parentNode for nodes, but
// it's not ideal because it makes the CSSOM's behavior depend on the timing of garbage collection.
for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
if (m_childRuleCSSOMWrappers[i])
m_childRuleCSSOMWrappers[i]->setParentStyleSheet(0);
}
for (unsigned i = 0; i < m_extraChildRuleCSSOMWrappers.size(); ++i)
m_extraChildRuleCSSOMWrappers[i]->setParentStyleSheet(0);
if (m_mediaCSSOMWrapper)
m_mediaCSSOMWrapper->clearParentStyleSheet();
m_contents->unregisterClient(this);
}
void CSSStyleSheet::extraCSSOMWrapperIndices(Vector<unsigned>& indices)
{
indices.grow(m_extraChildRuleCSSOMWrappers.size());
for (unsigned i = 0; i < m_extraChildRuleCSSOMWrappers.size(); ++i) {
CSSRule* cssRule = m_extraChildRuleCSSOMWrappers[i].get();
ASSERT(cssRule->type() == CSSRule::STYLE_RULE);
StyleRule* styleRule = toCSSStyleRule(cssRule)->styleRule();
bool didFindIndex = false;
for (unsigned j = 0; j < m_contents->ruleCount(); ++j) {
if (m_contents->ruleAt(j) == styleRule) {
didFindIndex = true;
indices[i] = j;
break;
}
}
ASSERT(didFindIndex);
if (!didFindIndex)
indices[i] = 0;
}
}
void CSSStyleSheet::willMutateRules()
{
// If we are the only client it is safe to mutate.
if (m_contents->hasOneClient() && !m_contents->isInMemoryCache()) {
m_contents->setMutable();
return;
}
// Only cacheable stylesheets should have multiple clients.
ASSERT(m_contents->isCacheable());
Vector<unsigned> indices;
extraCSSOMWrapperIndices(indices);
// Copy-on-write.
m_contents->unregisterClient(this);
m_contents = m_contents->copy();
m_contents->registerClient(this);
m_contents->setMutable();
// Any existing CSSOM wrappers need to be connected to the copied child rules.
reattachChildRuleCSSOMWrappers(indices);
}
void CSSStyleSheet::didMutateRules()
{
ASSERT(m_contents->isMutable());
ASSERT(m_contents->hasOneClient());
didMutate(PartialRuleUpdate);
}
void CSSStyleSheet::didMutate(StyleSheetUpdateType updateType)
{
Document* owner = ownerDocument();
if (!owner)
return;
// Need FullStyleUpdate when insertRule or deleteRule,
// because StyleSheetCollection::analyzeStyleSheetChange cannot detect partial rule update.
StyleResolverUpdateMode updateMode = updateType != PartialRuleUpdate ? AnalyzedStyleUpdate : FullStyleUpdate;
owner->modifiedStyleSheet(this, RecalcStyleDeferred, updateMode);
}
void CSSStyleSheet::registerExtraChildRuleCSSOMWrapper(PassRefPtr<CSSRule> rule)
{
m_extraChildRuleCSSOMWrappers.append(rule);
}
void CSSStyleSheet::reattachChildRuleCSSOMWrappers(const Vector<unsigned>& extraCSSOMWrapperIndices)
{
ASSERT(extraCSSOMWrapperIndices.size() == m_extraChildRuleCSSOMWrappers.size());
for (unsigned i = 0; i < extraCSSOMWrapperIndices.size(); ++i)
m_extraChildRuleCSSOMWrappers[i]->reattach(m_contents->ruleAt(extraCSSOMWrapperIndices[i]));
for (unsigned i = 0; i < m_childRuleCSSOMWrappers.size(); ++i) {
if (!m_childRuleCSSOMWrappers[i])
continue;
m_childRuleCSSOMWrappers[i]->reattach(m_contents->ruleAt(i));
}
}
void CSSStyleSheet::setDisabled(bool disabled)
{
if (disabled == m_isDisabled)
return;
m_isDisabled = disabled;
didMutate();
}
void CSSStyleSheet::setMediaQueries(PassRefPtr<MediaQuerySet> mediaQueries)
{
m_mediaQueries = mediaQueries;
if (m_mediaCSSOMWrapper && m_mediaQueries)
m_mediaCSSOMWrapper->reattach(m_mediaQueries.get());
// Add warning message to inspector whenever dpi/dpcm values are used for "screen" media.
reportMediaQueryWarningIfNeeded(ownerDocument(), m_mediaQueries.get());
}
unsigned CSSStyleSheet::length() const
{
return m_contents->ruleCount();
}
CSSRule* CSSStyleSheet::item(unsigned index)
{
unsigned ruleCount = length();
if (index >= ruleCount)
return 0;
if (m_childRuleCSSOMWrappers.isEmpty())
m_childRuleCSSOMWrappers.grow(ruleCount);
ASSERT(m_childRuleCSSOMWrappers.size() == ruleCount);
RefPtr<CSSRule>& cssRule = m_childRuleCSSOMWrappers[index];
if (!cssRule) {
if (index == 0 && m_contents->hasCharsetRule()) {
ASSERT(!m_contents->ruleAt(0));
cssRule = CSSCharsetRule::create(this, m_contents->encodingFromCharsetRule());
} else
cssRule = m_contents->ruleAt(index)->createCSSOMWrapper(this);
}
return cssRule.get();
}
bool CSSStyleSheet::canAccessRules() const
{
if (m_isInlineStylesheet)
return true;
KURL baseURL = m_contents->baseURL();
if (baseURL.isEmpty())
return true;
Document* document = ownerDocument();
if (!document)
return true;
if (document->securityOrigin()->canRequest(baseURL))
return true;
return false;
}
PassRefPtr<CSSRuleList> CSSStyleSheet::rules()
{
if (!canAccessRules())
return 0;
// IE behavior.
RefPtr<StaticCSSRuleList> nonCharsetRules = StaticCSSRuleList::create();
unsigned ruleCount = length();
for (unsigned i = 0; i < ruleCount; ++i) {
CSSRule* rule = item(i);
if (rule->type() == CSSRule::CHARSET_RULE)
continue;
nonCharsetRules->rules().append(rule);
}
return nonCharsetRules.release();
}
unsigned CSSStyleSheet::insertRule(const String& ruleString, unsigned index, ExceptionState& es)
{
ASSERT(m_childRuleCSSOMWrappers.isEmpty() || m_childRuleCSSOMWrappers.size() == m_contents->ruleCount());
if (index > length()) {
es.throwUninformativeAndGenericDOMException(IndexSizeError);
return 0;
}
CSSParser p(m_contents->parserContext(), UseCounter::getFrom(this));
RefPtr<StyleRuleBase> rule = p.parseRule(m_contents.get(), ruleString);
if (!rule) {
es.throwUninformativeAndGenericDOMException(SyntaxError);
return 0;
}
RuleMutationScope mutationScope(this);
bool success = m_contents->wrapperInsertRule(rule, index);
if (!success) {
es.throwUninformativeAndGenericDOMException(HierarchyRequestError);
return 0;
}
if (!m_childRuleCSSOMWrappers.isEmpty())
m_childRuleCSSOMWrappers.insert(index, RefPtr<CSSRule>());
return index;
}
void CSSStyleSheet::deleteRule(unsigned index, ExceptionState& es)
{
ASSERT(m_childRuleCSSOMWrappers.isEmpty() || m_childRuleCSSOMWrappers.size() == m_contents->ruleCount());
if (index >= length()) {
es.throwUninformativeAndGenericDOMException(IndexSizeError);
return;
}
RuleMutationScope mutationScope(this);
m_contents->wrapperDeleteRule(index);
if (!m_childRuleCSSOMWrappers.isEmpty()) {
if (m_childRuleCSSOMWrappers[index])
m_childRuleCSSOMWrappers[index]->setParentStyleSheet(0);
m_childRuleCSSOMWrappers.remove(index);
}
}
int CSSStyleSheet::addRule(const String& selector, const String& style, int index, ExceptionState& es)
{
StringBuilder text;
text.append(selector);
text.appendLiteral(" { ");
text.append(style);
if (!style.isEmpty())
text.append(' ');
text.append('}');
insertRule(text.toString(), index, es);
// As per Microsoft documentation, always return -1.
return -1;
}
int CSSStyleSheet::addRule(const String& selector, const String& style, ExceptionState& es)
{
return addRule(selector, style, length(), es);
}
PassRefPtr<CSSRuleList> CSSStyleSheet::cssRules()
{
if (!canAccessRules())
return 0;
if (!m_ruleListCSSOMWrapper)
m_ruleListCSSOMWrapper = adoptPtr(new StyleSheetCSSRuleList(this));
return m_ruleListCSSOMWrapper.get();
}
String CSSStyleSheet::href() const
{
return m_contents->originalURL();
}
KURL CSSStyleSheet::baseURL() const
{
return m_contents->baseURL();
}
bool CSSStyleSheet::isLoading() const
{
return m_contents->isLoading();
}
MediaList* CSSStyleSheet::media() const
{
if (!m_mediaQueries)
return 0;
if (!m_mediaCSSOMWrapper)
m_mediaCSSOMWrapper = MediaList::create(m_mediaQueries.get(), const_cast<CSSStyleSheet*>(this));
return m_mediaCSSOMWrapper.get();
}
CSSStyleSheet* CSSStyleSheet::parentStyleSheet() const
{
return m_ownerRule ? m_ownerRule->parentStyleSheet() : 0;
}
Document* CSSStyleSheet::ownerDocument() const
{
const CSSStyleSheet* root = this;
while (root->parentStyleSheet())
root = root->parentStyleSheet();
return root->ownerNode() ? &root->ownerNode()->document() : 0;
}
void CSSStyleSheet::clearChildRuleCSSOMWrappers()
{
m_childRuleCSSOMWrappers.clear();
}
}